Typewriter



' 1 644,108 1927' c. u. CARPENTER TYPEWRITER Filed Oct. 27, 1923 2 Sheets-Sheet 1 Patented Oct. 4, 1927.

UNITED. STATES PATENT o jca CHARLES U. CARPENTER, 0E DAYTON, OHIO, ASSIGNOR, BY ME sNEAssIoNMENTs, TO JA EsE. STERRETT, H. E. DEVENS, Ann J. RAMSEY SPEER.

Application filed 0ctc..er 27, 1923. Serial No. 671,262.

My invention relates to typewriters, and, in particular, to the mechanism for adjusting and determining the spacing between lines on the typewriter. Y

It'is the object of my invention to provide single spacing, a space and a half spacing, and double spacing.

It is an additional object to provide such spacing and attendant mechanism that the platen may be moved uniformly the exact cording to my invention, to move both ratchets a total of three teeth for double spacing, or one tooth on the outside ratchet for single spacing, or two teeth on both ratchets for space and a half spacing.

It is a further object to provide means of holding the platen for the particular spacing desired, or placing said holding meansinto a neutral'position, as the operator may desire, in order to secure the adjustment of ratchets. i

Turning to the drawings:

Figure 1 is a side elevation from the right hand side of the machine, showing the several parts assembled on the carriage.

Figure 2 illustrates the position of the setting pawl and its locking mechanism for one and a half spacing.

Figure 3 is a similar view for double spacing.

Figure 4 is a similar View for single spacmg.

Figure 5 is an enlarged view of the platen spacing'pawl arm.

Figure 6 is a perspective of the platen spacing pawl arm supporting the pawls.

Figure 7 is a front elevation of the assembledmechanism. v v

Figure 8 is a plan view of Figure 7 Figure 9 is a side elevation of the single and double spacing ratchet and the paper release lever. Y

Figure 10 is aside elevation of theone and a half spacing ratchet and the platen ratchet release lever. I i a i Figure 11 is a plan view of'the carriage rack release lever. a

Figure 12 is an end elevation of Figure 11. Figure 13 is a plan view of the platen ratchet release lever.

Figure 14 is a side elevation thereof.

Figure 15 is a side elevation of the single and double spacing ratchet. I

Figure 16 is a side elevation of the and a half spacing ratchet.

Figure 17 is a plan view ofthe paperroll release lever.' i

Figure- 18 is a side elevation of thepaper roll release lever. a

one

Figure 19 is a side elevation of the platen spacing pawl arm.-

Figure 20 is anend elevation thereof. Figure 21 is a plan view of the lever actuating the spacing mechanism.

Figure 22 is a side elevation thereof. Figure 23 is an end elevation of 'a portion of the frame associated with'this part of the typewriter.

Figure 24 is an end elevation of Figure 23. Referring to the drawings in detail:

' i 1 is a frame which consists primarily of an end plate having an aperture 2 for the' reception of the shaft 3, which supports the platen4. Mounted upon this platen shaft on the end thereof are two ratchets. The inner ratchet is designated 5, and is. known as the space and a half ratchet. It has eighteen teeth. The outer ratchet, designated 6, has twenty-seven teeth, and is used for'the single and double spacing. Between these ratchets,

mounted on a hub on the axle of the platen is a lever 7, which is known as the platen ratchet release lever. This level" 7 is provided with a thumb piece 8 and an eye 9, which eye fits upon the hub carried on the platen. A cam 10 is associated with this lever between the stops 11 and'12. This cam is so arranged that it will engage with the roller 13, which serves to hold the single and double spacing ratchet 6 in position, and also with the roller 14, which serves to 'hold the one and a half spacin ratchet in position. It is adapted to move these rollers out of engagement with their respective ratchets in succession, and also is adapted to move both of them out of engagement with either ratchet when the lever is in neutral position. These rollers are carried in y-okes 15 and 16 respectively. The yokes in turn are supported upon a V-shaped spring bracket 17, which holds the rollers yieldingly againstthe ratchets. It will be observed that as the platen ratchet release lever is rotated about its hub, the engagement of the respective cams will actuate the respective rollers, while the stops 11 and 12'will limit the movement of thelever and its cams as they respectively engage the rollers 13 and 14.

The platen release lever in the position A presses down the roller 14. In position B the lever is in neutral, then both rollers are out of engagement with both ratchets, and

v in position C the roller 14 is in engagement with its ratchet.

Thus it will be seen that, by reason of the engagement of the proper roller with the properratchet, any overrun of the ratchet and the accompanying platen will be prevented, and the platen will be moved the predetermined spaces desired, and no more, when it is suitably actuated by the mechanism to be hereinafter described.

The frame 1 has an outwardly extending ledge or platform 18, upon which there is mounted the spacing lever 19, which has a finger piece 20. This handle is pivotally mounted on the bracket 18 on a stud 21. Around the stud is wrapped a helical spring 22, one end of which is anchored on a pin 23, carried by the bracket, and the other end of which, as at 24, engages with a notch 25 in the side of the lever 19, thus serving always to return the lever to its initial actuating position. A projecting arm and eye on the end thereof, designated 26, is formed, integral with the spacing lever 19. Pivoted thereto and connected in said eye by a bolt 27, is an actuating arm 28, which extends rearwardly to a point adjacent to and above the platen, where it engages in an eye 29 with anupwardly projecting arm 30, which is formed integral with the two pawls 31 and 32, which are joined together by the member 33.

Thus by a movement of the spacing lever, the pawls may be'reciprocated back and forth. Pivotally supporting these pawls is the platen spacingpawl arm 34. The upper end of'this arm is provided with an eye 35,

through which a pin 36 is inserted for pivotal engagement with the pawls. This platen spacing-pawl arm has an enlarged collar 37 for mounting upon a hub of the platen. Connected to'this collar is a projecting stop 38,which engages with a stud 39, which limitsfitsmovement in a backward direction,

due to the influence of a spring 40, one end of which is connected at 41 to the platen spacing pawl arm, and the other end of which is anchored, as at 42, to the face of the side plate 1. The teeth 43 and 44 of the pawls 31 and 32 respectively engage with the teeth 45 and 46 of the respective ratchets 5 and 6. V

It will be noted that the teeth on these respective ratchets coincide or are opposite to each other at every fourth tooth of ratchet 6 and at every third tooth of ratchet 5;

In order to determine to what extent the pawls may throw the ratchet, and therefore the platem'an adjust-able cam stop'is provided, for engagement with the platen spao ingpawl arm 34. A. notch 47 is provided, in one edge of the platen spacing pawl arm 34, for the reception of this cam, which is designated 48. The cam is mounted upona stud 49, iournaled in the frame 1, and actuatedby a knurled head 50, so that the cam may be rotated. To maintain the cam in any desired position, a setting cam 51 is provided, fixed thereto, having a pluralityof notches 52 with which a bent spring 53 successively engages, to-lock the cam in position, this spring being carried upon a stud 54 on the frame 1.

The cam itself is'provided with acam surface 55, 56, and 57. lVhen .55 engages with the notch 47, an actuation of the'lever 19 will move the platen two spaces. I If the cam engages the notch 47, then the actuation will be only one space; while if the cam 57 engages with the notch 47, the actuation will extend to a space anda half.

53 designates a paper roll release lever, which is-illustrated in order to show the complete assem- .bly of parts, but is of no interest inconneo tooth on the outside ratchet. is for one and a half spacing, there will 'be a movement of a total of two teeth on both ratchets. The uneven number of teeth, and, consequently. their uneven spacing, so that such teeth are not opposite to each other except atcertain predetermined intervals, permits of this arrangement.

It will be understood that I desire to com- If the setting is for a single spac1ng,thenthe movement will'be only one If the setting. 3

prehend within my invention such modifications as may be fairly embraced within it,

and as may be found necessary in adapting it to various conditions in the art in the course of the application of the invention,

Having thus fully described my invention, what I claim as new, and desire to'secure by Letters Patent, is: v

1. 'In a spacing mechanism for a typewriter, a frame mounted on a carriage,a platenjournaled in said frame, a pair of ratchets mounted O11 'S2Ll(l platen at one end thereof, having an unequal number of teeth, given teeth on each of said ratchets being opposite each other at certain spaced intervals, a platform on said frame, a horizontally moving lever thereon, limiting means to keep said lever in its initial position, an act-uating lever connected therewith for reciprocatory movement, a pair of pawls adapted to be actuated thereby and adapted to engage said ratchets, a platen spacing pawl arm supporting said pawls pivotally, said arm being journaled on the shaft of said platen, and cam means adapted to engage said arm to limit the movement thereof, to determine the extent of throw by said pawls of said ratchets and platen. 1

2. In a spacing mechanism for a typewriter, a frame mounted on a carriage, a platen journaled in said frame, a pair of ratchets mounted on said platen at one end thereof, having an unequal number of teeth, given teeth on each of said ratchets being opposite each other at certain spaced intervals, a platform on said frame, a horizontally moving lever thereon, limiting means to keep said lever in its initial position, an actuating lever connected therewith for reciproeatery movement, a pair of pawls adapted to be actuated thereby and adapted to engage said ratchets, a platen spacing pawl arm supporting said pawls pivotally, said arm being journaled on the shaft of said platen, cam means adapted to engage said arm to limit the movementthereof, to determine the extent of throw by said pawls of said ratchets and platen, and means to maintain said cam means in a predetermined position.

3. In a spacing mechanism for a typewriter, a frame mounted on a carriage, a platen journaled in said frame, a pair of ratchets mounted on saicLplaten at one end thereof, having an unequal number of teeth, given teeth on each of said ratchets being opposite each other at certain spaced intervals, a latform on said frame, a horizontally movlng lever thereon, limiting means to keep said lever in its initial position, an actuating lever connected therewith for reciproeatory movement, a pair of pawls adapted to be actuated thereby and adapted to engage said ratchets, a platen spacing pawl arm sup porting said pawls pivotally, said arm being journaled on the shaft of said platen, cam means adapted to engage said arm to limit the movement thereof, to determine the extent of throw by said pawls'of said ratchets I vals, a platform on said frame, a horizontally moving lever thereon, limiting means to keep said lever in its initial position, an actuating lever connected therewith for reciprocatory movement, a pair of pawls adapted to beactuated thereby and adapted to engagesaid ratchets, a, platen spacing pawl arm supporting said pawls pivotally, saidarm being journaled on the shaft of said platen, cam means adapted to engage said arm to limit the movement thereof, to determine the extent 01" throw by said pawls of said ratchets and platen, means to maintain said cam means in a predetermined position, means to move saidcam out of its predetermined position into another position, and means adapted to engage with the successive ratchets for preventing an overrun of said platen.

5. In a spacing mechanism for a typewriter, a frame mounted on a carriage, a platen ournaled 1n. said frame, a pair of ratchets mounted on said platen at one end thereof, having an unequal number of teeth,

given teeth on each of said ratchets being opposite each other at certain spaced intervals, a platform on said frame, a horizontally moving lever thereon, limiting means to keep said lever in its initial position, an actuating lever connected therewith for reciprocatory movement, a pair of pawls adapted to be actuated thereby and adapted to engage said ratohets, a platen spacing pawl arm supporting said pawls pivotally, said arm being journaled on the shaft of said platen, cam means adapted to engage said arm to limit the movement thereof, to determine the extent of throw by said pawls of said ratchets and platen, means to maintain said cam means in a predeterminedposition, means to move said cam out of its predetermined position into another position, means adapted to engage with the successive ratchets for preventing an overrun of said platen, and means of adjusting the position of said overrun-preventing means. 7 e

6. In a spacing mechanism for a typewriter, a carriage, a frame mounted thereon, platen journaled in said frame, a spacing lever mounted on said frame, yielding means to return said spacing lever to its inoperative position, a U-shaped member having spaced teeth constituting pawls connected to said spacing lever, a pair of ratohets engagingtherewith mounted on the end of said for holding it in position.

'7, In a spacing mechanism for a typewriter, a frame, a platen journaled therein, a pair of ratchets having an unequal number of teeth mounted on one end of said platen,

, pair of-pawls connected to one another at one end and engaging said respective ratchets, an arm pivotally supported on said platen for supporting said pawls, a stop on one of said ratchets for engaging a stop on the platen spacing pawl arm supporting the pawls, adapted to limit the movement of the platen spacing pawl arm, yielding means connected to said pawl arm and to one of said ratcliets for moving said pawl arm against the stop, an arm projecting from said 'pawls, a horizontally moving lever connected M mes with said arm, a transversely moving lever mounted on said frame 'and connected/to said horizontally moving arm, yielding means to maintain said horizontally moving arm inhorrnally retracted positionfa cam.

member having points of varying lengths adapted to engage with said pawl arm, to

determine the extent of its movement, 'means to maintain saidcam member in selected positions for, the respective spacings desired, L

means to rotate said cam member, a V-shaped spring support mounted on said carriage, having rollers on either end thereof for en gagement with the I respective ratchetsfa platen ratchet release lever journaled on said platen, cams thereon for engagement wlth,"

the said rollers alternately or simultaneously, to provide alternate engagement of rollers with the ratchet, or the disengagement of both rollers from both ratchets, and stops associated'with said cams and saidjplaten ratchet release lever for engaging with rollers alternately, to limit the movem' of said platen ratchet release lever, o

In testimony whereof, I 'afliX my sign ture.

CHARLES CARPENTER, 

